Research on the Resistance Characteristics of Ballasted Track of Heavy Haul Railway Based on Discrete Element Method
Research purposes:Ballasted tracks are widely used in heavy haul railway.As the service time increases,the performance of the line resistance presents a dynamic evolution characteristic.As the key to solve the beam-track interaction,the selection of reasonable and accurate longitudinal line resistance is a prerequisite to ensure the accuracy and reliability of the calculation results of the beam-track interaction,which is related to the normal use and safe operation of the beam-track system.Research conclusions:(1)The longitudinal line resistance decreases gradually with the grain gradation from coarse to fine,and increases gradually with the friction coefficient from small to large.(2)The dynamic evolution model of longitudinal line resistance is obtained by combining the longitudinal line resistance displacement curve simulated by the ballast bed model established by different gradation.It can be seen that the longitudinal line resistance evolves from 29.7 kN/m/line of the new line to 23.6 kN/m/line of the fully broken line and the degradation is about 20.5%.(3)The research results can provide key parameters for the study of beam-track interaction of heavy-haul railways during the full service period.
line resistanceballasted trackdiscrete element methodballast graduationtime-varying characteristics
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